refactor: split Rust core and CLI and remove Python API (OSS-308)

[Acture]

ScriptMark now exposes its Rust core and CLI directly under src/core and src/cli. The CLI depends on the core, while Canvas HTTP, SQLite, terminal UI and presentation remain in the CLI crate. This removes the extra src/crates layer and the unused external Python API, PyO3/Maturin packaging and wheel/PyPI release jobs. Python execution for student assignments, teacher checkers and reference solutions remains supported.

Workspace dependencies, existing tests and fixtures, CI, crate publication and current documentation follow the new layout. CSV/XLSX grade-sheet export from master is preserved in the core, with its CLI integration tests adapted to the new paths.

Validation on 1449ee4: 425 workspace tests, Clippy with warnings denied and formatting passed locally; GitHub CI also passed. Both crates passed packaging and build verification in a fresh target directory. The original target's temporary registry reused an older same-version core archive, so that failed attempt was retained separately. Earlier refactor validation also covered actionlint, CLI startup, core dependency isolation, and a fresh remote clone with source fixtures and notes initialized.

Linear: OSS-308.

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📥 Commits

Reviewing files that changed from the base of the PR and between cf5cab8 and 1449ee4.

⛔ Files ignored due to path filters (2)

• src/cli/tests/fixtures/hw1/local/roster.csv is excluded by !**/*.csv
• src/core/tests/fixtures/archives/m3_default.rar is excluded by !**/*.rar

📒 Files selected for processing (90)

• .github/workflows/ci.yml
• .github/workflows/release.yml
• .gitignore
• CLAUDE.md
• Cargo.toml
• README.md
• pyproject.toml
• src/cli/Cargo.toml
• src/cli/src/canvas/bundle.rs
• src/cli/src/canvas/client.rs
• src/cli/src/canvas/mod.rs
• src/cli/src/db/mod.rs
• src/cli/src/db/queries.rs
• src/cli/src/db/results.rs
• src/cli/src/db/roster.rs
• src/cli/src/db/schema.rs
• src/cli/src/display.rs
• src/cli/src/lib.rs
• src/cli/src/main.rs
• src/cli/src/report.rs
• src/cli/src/report_template.html
• src/cli/src/tui/app.rs
• src/cli/src/tui/mod.rs
• src/cli/src/tui/ui.rs
• src/cli/tests/canvas_fetch.rs
• src/cli/tests/cli.rs
• src/cli/tests/examples.rs
• src/cli/tests/fixtures/hw1/canvas/assignment.json
• src/cli/tests/fixtures/hw1/canvas/files/1001/lab1.py
• src/cli/tests/fixtures/hw1/canvas/files/1002/draft.py
• src/cli/tests/fixtures/hw1/canvas/files/1003/lab1.py
• src/cli/tests/fixtures/hw1/canvas/files/1004/lab1.py
• src/cli/tests/fixtures/hw1/canvas/files/1005/lab1.py
• src/cli/tests/fixtures/hw1/legacy_results.json
• src/cli/tests/fixtures/hw1/local/submissions/0024010003_lab1.py
• src/cli/tests/fixtures/hw1/local/submissions/2024010001_lab1.py
• src/cli/tests/fixtures/hw1/local/submissions/2024010002_lab1.py
• src/cli/tests/fixtures/hw1/local/submissions/2024010005_notes.txt
• src/cli/tests/fixtures/hw1/local/submissions/24010003_lab1.py
• src/cli/tests/fixtures/hw1/local/submissions/_scratch_v2.py
• src/cli/tests/grade_sheet.rs
• src/cli/tests/input_equivalence.rs
• src/cli/tests/matching.rs
• src/cli/tests/record.rs
• src/core/Cargo.toml
• src/core/src/archive.rs
• src/core/src/assignment.rs
• src/core/src/checker/builtin.rs
• src/core/src/checker/mod.rs
• src/core/src/checker/python_checker.rs
• src/core/src/checker/rhai_checker.rs
• src/core/src/discovery.rs
• src/core/src/export.rs
• src/core/src/grading.rs
• src/core/src/input/canvas.rs
• src/core/src/input/mod.rs
• src/core/src/lib.rs
• src/core/src/matching.py
• src/core/src/matching.rs
• src/core/src/models/config.rs
• src/core/src/models/mod.rs
• src/core/src/models/result.rs
• src/core/src/models/spec.rs
• src/core/src/models/submission.rs
• src/core/src/record.rs
• src/core/src/roster.rs
• src/core/src/runner/answers.rs
• src/core/src/runner/executor.rs
• src/core/src/runner/frozen.rs
• src/core/src/runner/generation.rs
• src/core/src/runner/generator.rs
• src/core/src/runner/harness.py
• src/core/src/runner/judge.rs
• src/core/src/runner/linter.rs
• src/core/src/runner/mod.rs
• src/core/src/runner/oracle.rs
• src/core/src/runner/orchestrator.rs
• src/core/src/runner/prepare.rs
• src/core/src/runner/python.rs
• src/core/src/runner/records.rs
• src/core/src/runner/sandbox.rs
• src/core/src/similarity.rs
• src/core/src/spec_loader.rs
• src/core/tests/generated.rs
• src/core/tests/harness.rs
• src/core/tests/integration.rs
• src/core/tests/oracle.rs
• src/crates/scriptmark-py/Cargo.toml
• src/crates/scriptmark-py/src/lib.rs
• src/python/scriptmark/__init__.py

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